/*---------- 公共样式 ----------*/
.fl{
  float: left;
}
.fr{
  float: right;
}
.clearfix::after{
  content: "";
  display: block;
  height: 0;
  clear: both;
}
main{
  margin-bottom: 100px;
}
footer{
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  max-height: 100px;
  background-color: #fff;
}
.nav-ul{
  display: flex;
  justify-content: center;
}
.nav-li{
  display: flex;
  justify-content: center;
  max-height: 80px;
  flex: 1;
}
.nav-li img{
  max-height: 80px;
  max-width: 80px;
}

